Peracetic acid (PAA) disinfection of primary, secondary and tertiary treated municipal wastewaters
Peracetic acid (PAA) disinfection of primary, secondary and tertiary treated municipal wastewaters
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DOI：
10.1016/j.watres.2005.08.016
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发表时间：
2005-11-01
期刊：
影响因子：
12.8
通讯作者：
Heinonen-Tanski, H
中科院分区：
文献类型：
--
作者：
Koivunen, J;Heinonen-Tanski, H
中试研究了过氧乙酸（PAA）对城市污水中肠道细菌和病毒的消毒效果。以库奥皮奥城市污水处理厂的一、二级出水或溶气浮选（DAF）装置的三级出水作为消毒中试污水。二级和三级污水中的消毒剂剂量为2至7毫克/升PAA，一级污水中的消毒剂剂量为5至15毫克/升PAA。消毒接触时间4 ~ 27 min。用2-7 mg/l PAA和27分钟接触时间消毒二级和三级污水，可使总大肠菌群（TC）和肠球菌（EC）减少约3倍。PAA消毒也显著改善了一次出水的卫生质量：10-15 mg/l PAA使TC和EC减少了3-4 log， 5 mg/l PAA使TC和EC减少了2 log以下。F-RNA噬菌体对PAA消毒更有抵抗力，在一级、二级和三级污水的消毒处理中，这些肠道病毒通常减少约1 / log。大多数微生物减少发生在接触时间的前4-18分钟，这取决于PAA剂量和微生物。二、三级出水除COD、SS、浊度、253.7 nm透光率等水质和温度变化不大外，PAA消毒效率保持相对稳定。在微生物、有机物和悬浮物浓度较高的一次出水中，消毒效率明显下降。结果表明，PAA可作为一种良好的替代消毒方法，用于去除不同废水中的肠道微生物。(c) 2005 Elsevier Ltd版权所有。
The efficiency of peracetic acid (PAA) disinfection against enteric bacteria and viruses in municipal wastewaters was studied in pilot-scale. Disinfection pilot-plant was fed with the primary or secondary effluent of Kuopio municipal wastewater treatment plant or tertiary effluent from the pilot-scale dissolved air flotation (DAF) unit. Disinfectant doses ranged from 2 to 7 mg/l PAA in the secondary and tertiary effluents, and from 5 to 15 mg/l PAA in the primary effluents. Disinfection contact times were 4-27 min. Disinfection of secondary and tertiary effluents with 2-7 mg/l PAA and 27min contact time achieved around 3 log reductions of total coliforms (TC) and enterococci (EC). PAA disinfection also significantly improved the hygienic quality of the primary effluents: 10-15 mg/l PAA achieved 3-4 log reductions of TC and EC, 5 mg/l PAA resulting in below 2 log reductions. F-RNA coliphages were more resistant against the PAA disinfection and around I log reductions of these enteric viruses were typically achieved in the disinfection treatments of the primary, secondary and tertiary effluents. Most of the microbial reductions occurred during the first 4-18 min of contact time, depending on the PAA dose and microorganism. The PAA disinfection efficiency remained relatively constant in the secondary and tertiary effluents, despite of small changes of wastewater quality (COD, SS, turbidity, 253.7 nm transmittance) or temperature. The disinfection efficiency clearly decreased in the primary effluents with substantially higher microbial, organic matter and suspended solids concentrations. The results demonstrated that PAA could be a good alternative disinfection method for elimination of enteric microbes from different wastewaters. (c) 2005 Elsevier Ltd. All rights reserved.